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Anilox Line screen question

PostPosted: Mon Aug 28, 2017 11:39 am
by hizuka007
Hi,
I have a question, we have a flexography in the company from where I work, it and the manual is full chinese but I can translate it using google translate (not 100% accurate). And one that I see is the Lines per inch or Line Screen which is 300. Does it mean that the flexo can handle a 300 LPI halftone? or if not then what is the maximum halftone LPI that this machines can handle?

Thank you

Re: Anilox Line screen question

PostPosted: Mon Aug 28, 2017 12:37 pm
by richflexo
Hi,

In anilox terms, 300lpi is considered a low line count. The rule use to be 5 or 6 times the dot LPI for the minimum LPI on an anilox. Check out this website for more details.

http://www.harperimage.com/AniloxRolls/ ... ine-Screen

Your 300 LPI would be suitable for line print or white plates only. Typically, anything over 700 LPI is mean for CMYK or screen print only.

rf

Re: Anilox Line screen question

PostPosted: Tue Aug 29, 2017 3:13 am
by hizuka007
so it can handle 60 Halftone Frequency (LPI) ? . am I correct?

Re: Anilox Line screen question

PostPosted: Tue Aug 29, 2017 4:51 pm
by richflexo
It will, but double check your BCM on the anilox. Are you printing wide web or narrow?

300 LPI anilox usually are high BCM for maximum ink coverage, like 3.0+ for white backup plates or spot type. Theoretically, yes you can do it. But test it out before a live job if possible. I wouldn't recommend printing screens, even at 50 LPI unless it just one tone of colour. You will get serious dot gain and would require major cut back if you're worried about it gaining.

BCM is billion cubic microns and is the amount of VOLUME of ink each cell holds. The lower the volume, ie: 1.5-2.0 is meant for process printing. Anything higher is for line work and combo printing.

rf

Re: Anilox Line screen question

PostPosted: Thu Aug 31, 2017 3:10 am
by hizuka007
I see,. I will test it, because the manual is in plain chinese.

Thanks

Re: Anilox Line screen question

PostPosted: Thu Aug 31, 2017 1:17 pm
by richflexo
If you are able to, get your plate supplier to make you a benchmark plate. This will have patches of different LPI's and sometimes different dot sizes. You can get them in ranges of line screens. Those charts will help you pick what the best LPI to use for that anilox.